"After the march left the INS building, plainclothes policemen who had infiltrated it tackled, brutalized, and hauled off at least two activists. The police became more and more aggressive, and organizers worried as the march began to be hemmed in. They led the protest back to Market street and headed up the street, sometimes running as police attempted to drive motorcycles into the crowd. Organizers looked for a place to disperse peacefully and called the march to an end at the Powell street BART station. Many protesters then entered the BART, only to be chased down into the station by police officers in riot gear. What happened in the BART station is still unclear."